In the United States, regulation of the roofing trade is left up to individual states. Some states leave roofing regulation up to county-level and municipal-level jurisdictions.[5] In California, for example, the California Contractors State License Board licenses and monitors roofing contractors.[6] Unlicensed contracting of projects worth over a set threshold may result in stiff fines or even time in prison.[7] In Oklahoma roofers are required to meet insurance and roofing license guidelines. Roofers are also required to show their license number on their marketing material.